Distractor, bone screw for said distractor, and method for producing said distractor

Abstract

A distractor for palatal expansion is disclosed. A high degree of treatment safety can be insured if anchoring parts each have at least two tooth supports and each subsection has at least one of the tooth supports and at least one of the palate rests to which this tooth support is connected in order to thus fix the support surfaces in their position against the palate.

The invention claimed is: 
     
         1 . A distractor for palatal expansion, comprising:
 an expansion part that has at least two expansion elements spaced apart from each other that are adjustable along a longitudinal axis and   two anchoring parts that are each fastened to a respective expansion element, wherein each anchoring part of the two anchoring parts that is divided into two subsections by the longitudinal axis has at least one palate rest and at least one tooth support in each of the two subsections,   wherein each palate rest of the at least one palate rest has a support surface for contacting a palate and at least one through hole provided in a region of the support surface to accommodate a fastening element for anchoring to a palatine bone of the palate,   wherein each tooth support of the at least one tooth support has a first contact surface for contacting at least a portion of a palatal side surface of a tooth and a second contact surface for contacting at least a portion of an occlusal surface of the tooth, wherein the second contact surface overhangs the first contact surface and forms an occlusal tooth rest, in order to thus position the support surfaces against the palate,   wherein each of the two anchoring parts has at least two tooth supports and wherein each subsection has at least one of the tooth supports and at least one of the palate rests to which this tooth support is connected in order to thus fix the support surfaces in their position against the palate, and   wherein in each anchoring part, each of the at least one tooth support is connected to the palate rests by a shared connector piece, and the connector piece splits into two legs, which each adjoin a palate rest of the at least one palate rest.   
     
     
         2 . The distractor according to  claim 1 , wherein the palate rests and the tooth supports of the respective anchoring part are directly connected to each other in a rigid way. 
     
     
         3 . The distractor according to  claim 1 , wherein a connection between the palate rests and each of the at least one tooth support of the respective anchoring part extends in such a way that the connection does not contact the palate. 
     
     
         4 . The distractor according to  claim 1 , wherein the at least one palate rest is an eyelet. 
     
     
         5 . The distractor according to  claim 1  wherein the two legs extend in a V shape in relation to each other and/or the respective expansion element adjoins the connector piece, which splits into the two legs in this region. 
     
     
         6 . The distractor according to  claim 1 , wherein each of the anchoring parts has two palate rests and/or two, three, or four tooth supports. 
     
     
         7 . The distractor according to  claim 1 , wherein a first tooth support has a molar band, which constitutes the first contact surface. 
     
     
         8 . The distractor according to  claim 7 , wherein a second tooth support has a half-palatal band that constitutes the first contact surface. 
     
     
         9 . The distractor according to  claim 1 , wherein each of the two anchoring parts is embodied of one piece by means of an additive production method. 
     
     
         10 . The distractor according to  claim 1 , wherein the through hole has an end section tapering conically from a hole edge. 
     
     
         11 . The distractor according to  claim 1 , wherein each of the two anchoring parts consists of a cobalt-chromium-tungsten alloy. 
     
     
         12 . The distractor according to  claim 1 , wherein each of the at least one tooth support of the two anchoring parts situated farthest toward an outside relative to the longitudinal axis defines a support plane between themselves, within which the palate rests are positioned. 
     
     
         13 . The distractor according to  claim 1 , wherein a first tooth support of each anchoring part is embodied so that it can be provided at a first tooth, which is a molar, and/or a second tooth support of each anchoring part is embodied so that it can be provided at a second tooth, which is a premolar. 
     
     
         14 . The distractor according to  claim 1 , wherein the support surfaces of the palate rests follow a contour of the palate and/or the tooth supports follow a contour of the relevant tooth. 
     
     
         15 . A bone screw for the distractor according to  claim 1 , wherein at a screw head, the bone screw has a truncated cone-shaped head section, which extends from a shaft of the bone screw. 
     
     
         16 . A method for producing the distractor according to  claim 1 , comprising taking a digital image of at least one section of a patient's jaw, and adapting the support surfaces and tooth supports to the digital image and, using an additive production method to produce the two anchoring parts with the adapted support surfaces and tooth supports.